- Grade
- Grade 0 – Normal
- Low grade
- Grade 1 – Mucosal oedema, hyperaemia and haemorrhage
- Grade 2A – Superficial localized ulcers, bleeding, exudates
- High Grade
- Grade 2B – Deep focal or circumferential ulcers
- Grade 3A – Focal necrosis with multiple and deep ulcerations and small scattered areas of necrosis
- Grade 3B – Extensive necrosis
